内置H型钢泥石流拦挡坝抗块石冲击性能研究

为了解决普通重力式泥石流拦挡坝在泥石流灾害中容易被大块石损毁的问题,充分利用H型钢塑性韧性好、抗冲击性能好的优点,提出了一种内置H型钢的新型泥石流拦挡坝(简称内置H型钢新型坝).运用有限元ABAQUS软件对其进行块石冲击作用下的数值模拟,从坝体的坝底支反力、顶部位移、加速度、能量吸收等方面与普通重力式泥石流拦挡坝进行动力响应的对比分析,结果表明:内置H型钢新型坝的支反力比普通坝可减小约1/2,新型坝的顶部位移是普通坝的9/13.混凝土与H型钢形成双重拦挡的效应,在混凝土崩裂后,H型钢仍具有较好的承载能力与变形能力.加入H型钢的新型坝改善了普通重力式泥石流拦挡坝的抗冲击性能,可有效减弱泥石流块石冲击的灾害.

Study on the impact resistance block stone of built-in H-shaped steel debris flow retaining dam

In order to solve the problem that ordinary gravity debris flow retaining dam is easy to be damaged by large rocks in debris flow disaster, and to make full use of the advantages of good plasticity and impact resistance of H-shaped steel, a new type of debris flow retaining dam with built-in H-shaped steel is proposed. The finite element ABAQUS software is used to carry out the numerical simulation under the impact of the block stone. The dynamic response of the dam is compared with that of the ordinary gravity debris flow retaining dam in terms of the dam bottom reaction force, top displacement, acceleration, energy absorption, etc. The results show that the reaction force of the new type of dam with built-in H-shaped steel is about 1/2 less than that of the ordinary dam, and the top displacement of the new type of dam is 9/13 of that of the ordinary dam. Concrete and H-steel form double retaining effect. After concrete crack, H-steel still has better bearing capacity and deformation capacity. The new type of dam with H-shaped steel improves the anti impact performance of the ordinary gravity debris flow retaining dam and weakens the disaster of debris flow block rock impact.